Crusher.



M. P. WILLIAMS.

CR USHER.

APPLICATION FILED SEPT. 28, 1914.

Patented Dec. 29, 1914.

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MILTON r. WILLIAMS, or sun LOUIS, rarsso'onr, assrenoa TO wILLrAivrs PATENT cnosnna AND rnnvnnrznn COMPANY, or s1. LOUIS, iarssonnr, a oonroaarron or MISSOURI.

CRUSI-IEB.

Specification of Letters Patent.

Patented Dec. 29, 1914:.

Application filed September 28, 1914. Serial No. 883,874.

To all whom it may concern:

Be it known. that I, MILTON F. WILLIAMS, a citizen of the United States, residing at city of St. Louis, State of Missouri, have invented a certain new and useful Improvement in Crushers, of which the following is a full, clear, and exact description, such as will en able others skilled in the art to which it appertains-to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a sectional elevation of a pulverizer containing my improvement. Fig. 2 is a detail illustrating a modified form.

My invention relates to certain improvements in rotary hammer mills which are used for reducing different materials. Its purpose is to increase the eiiiciency of the mill by securing more rapid reduction of the material, and to decrease the amount of power necessary to operate the mill. These results are obtained by providing the Hull with a spirally formed cover portion which is equipped with auxiliary breaker or baffle plates, the cover and the plates being dlsposed so as to increase the effectiveness of the hammers upon partially reduced frag ments of material and produce an arrangement whereby different fragments of the material act upon one another with a reducing effect.

By reference to the drawings, it will be understood that 1 represents the casing of a mill in which is mounted a cage or concave 2 and a rotary shaft a carrying pivoted heaters 5.

6 is a breaker plate disposed adjacent the feed opening 7, and 8 is a cover forming the upper portion of the grinding chamber.

vThis cover 8 is of spiral form, the radial distance thereof from the shaft decreasing from the terminus adjacent the concave to the other terminus which is adjacent the feed opening. On this casing 8 are disposed transverse breaker plates 9 which extend across the casing in the longitudinal direction of the shaft 4. The breaker plates 9 may project radially toward the shaft or may project toward the shaft non-rad1a1ly thereof. The width of the plates 9 is sufficient to extend to points adjacent the operating ends of the heaters when the machine is operated. Consequently, because of the spiral contour of the cover these breaker provides chambers 10 i the heaters into fragments of'varying sizes.

The material is then carried by the heaters over the concave 2 where it is to some extent reduced, the sufficiently small portions falling through. the openings in the concave. Fragments of the material will. be carried. past the concave by the heaters and pro jected into the chambers 10. Lighter or smaller fragments will be carried farther around with the heaters than will the larger fragments. Consequently, the general run of material at a point ust past the terminus of the concave will be larger than material.

at a point just ahead of the feed opening, and there will be less material carried to the chambers nearer the feed opening than to the chambers nearer the concave.

T he spiral. contour of the cover, wherein the chambers 10 are of different depths is for the purpose of securing a structure wherein the reducing action of the various fragments upon one another will be most effective. As the fragments are carried about by the heaters and projected into the chambers 10, they rebound from the auxiliary plates 9 and the cover 8 and work against one another continuously while they are in these chambers, due to the rapid ac tion of the heaters 5. Due to the fact that the chamber nearest the concave is of the greatest depth, it is enabled'to receive the comparatively large amount of material thrown into it, and give it the proper room for movement, while at the same time maintaining the coiipcrating surfaces in sulficientl y close relationship to secure rapid ac tion. Obviously, as the heaters move farther away from the concave, they will carry less of the material with them, and hence the chambers will receive less material according as they are farther from the concave. Due to the fact that they do receive such smaller quantities of material, these chamhers are rendered more effective by decreasing' their depth, whereby to bring the cooperating surfaces lnto more intimate relationship, While at the same time allowing sutlicientroom for the manipulation of the a casing having a. feed opening, a breaker plate disposed below the feed opening, rotary heaters operating Within thecasing and adapted to cooperate with the breaker plate,

a concave disposed ahead of the breaker plate in the direction of movement of the heaters, the casing having a cover portion disposed spirally relative tothe shaft, the portion thereof adjacent the terminus of the concave being farther radially from the shaft than the said concave and the said cover portion spirally approaching the shaft in the direction of movement of the beat ers, transverse breaker plates disposed on said cover portion at intervals to forin intermedi'ate chambers, the respective breaker plates being of different Widths and extend ing from the casing to points adjacent the orbit of the operating ends of the heaters.

comprising in oinhina 2. A rotary mill. 0 tion a grinding iniher having a'ioraininous cage portion. and a. cover and being provided with a feed opening, rotary heaters operating in saidgrinding L a breaker plate disposed between said lee opening and said cage portion, said cove portion being disposed spirally rclativ to the orbit of the heaters, the distance be tween the casing'and the operating ends of the heaters decreasing in the direction. oi. movement of the heaters, and a plurality of transversely disposed auxiliary breaker plates mounted on said coverpo'rtio'n and. spaced apart from one another and extending from the cover with the operating ends of the heaters.

' 3. In a crushing and pulverizing ma- -chine, the combination of a casing having feed opening, a. grinding surface, and spirally arranged cover having inwardly projecting portions forming, chambers of different depths into Which the material passing from the grinding surface is thrown by the action of the rotary heaters, the said chambers decreasing in depthip the direction of movement of the heaters,

In testimony whereof I hereunto afliX my signature in the presence of two witnesses, this 5th day of August 1914.]

MILTON F. VVILIKZIAMS.

"Witnesses:

M. P. SMITH, C. S. BUTLER.

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